how to return json encoded form errors in symfony

Question

I want to create a webservice to which I submit a form, and in case of errors, returns a JSON encoded list that tells me which field is wrong.

currently I only get a

Answer 1

I've finally found the solution to this problem here, it only needed a small fix to comply to latest symfony changes and it worked like a charm:

The fix consists in replacing line 33

if (count($child->getIterator()) > 0) {

with

if (count($child->getIterator()) > 0 && ($child instanceof \Symfony\Component\Form\Form)) {

because, with the introduction in symfony of Form\Button, a type mismatch will occur in serialize function which is expecting always an instance of Form\Form.

You can register it as a service:

services:
form_serializer:
    class:        Wooshii\SiteBundle\FormErrorsSerializer

and then use it as the author suggest:

$errors = $this->get('form_serializer')->serializeFormErrors($form, true, true);